To get an idea of exactly how small the worldâs smallest insect is, take out a ruler and look at those tiny lines that appear in between centimeters (make sure youâre not on the side that measures in inches). If in doubt, ask a grown-up to help you find the millimeters.
Diarrhea can also cause weight loss. Abdominal pain is another symptom of colon cancer that may prevent you from eating normally. If you have lost a significant amount of weight accompanied with these symptoms, you need to talk to your doctor immediately to determine the cause.
If your chemotherapy causes damage to the lining of your intestine, diarrhea may result. Not all chemotherapy drugs cause diarrhea, so ask your doctor whether it's a side effect of your specific type of treatment.1  Radiation therapy. 2  Radiation therapy that focuses on your abdomen, pelvis or lower back can cause diarrhea. 3  How severe your diarrhea will be depends on your radiation dose.f your chemotherapy causes damage to the lining of your intestine, diarrhea may result. Not all chemotherapy drugs cause diarrhea, so ask your doctor whether it's a side effect of your specific type of treatment.